Paper coating apparatus



J 10, 1952 R. A. SHERMAN ET AL 2,599,947

PAPER COATING APPARATUS Filed Jan. 21, 1950 INVENTORS lZ/ WP 0. Carlisle BYPobc f 14. Sbcrma n OML WM Patented June i0, 195.?

* UNITED STATES PATsNrT oFFicE ff Robert A. Sherman, Decatur, and Luther 0. Car

lisle, La Grange, Ill., assignors to A; E. Staley Manufacturing Gompany,Decatur, Ill a corporation of Delaware r Application January 21, 1950, Serial No. 139,834

g This invention pertains to coating processes in general and specifically to an improved apparatus and method for applying compositions such as colored, starch-clay coatings to paper board.

ZCIaims. (oi. 118-418) The smoothing roll rests-or more aptly turns or .fioatsin, a groove 5v of appropriate dimension running'lonjgitudinally along the, hollow support'roll 6; the diameter of which'may be about The improvement is especially advantageous in 5 three times that of the smoothing roll and which the corrugated box board industry for the coloris rotatably held at either end in appropriate ing of the liners. A common defect in such colbearings, not shown. This support roll may conored liners is that the final sheet shows a streaked veniently have a plurality of grooves of different 1or ripplted pattiefin 1due to irgplrotper spietading of 10 radii accllapteddto regfieive SllOOthing rolls of corhe coa ing on e iner. W ie his pa ern may respon ing ra ii an woun with wires of various .be desirable in special instances, it is ordinarily sizes. Coarser wire permits a heavier coating, undesirable and is an indication of faulty appliother things being equal, because the larger vcation and/or apparatus. Another common deshaped space between the wires permits more feet in many coating operations is that excessive coating to remain on the paper.

quantities of coating are unavoidably applied, The smoothing roll is held at either end in arms with a consequent increased cost to the manu- 1 fastened in locked position at the offset ends facturer. of the support roll by the bolts 8. Where a plu- Accordingly, the principal object of this invenrality of grooves are provided on the support roll, tioi; is to provide an app-arazus ang methodtfor a. corresponding plurality of such bolt-hole posicoa ing paper giving a smoo h, un orm coa ing ions are ikewise necessary. of a controllable, predetermined thickness. One end 9 of the smoothing roll extends beyond To the accomplishment of the foregoing and the supporting arm to provide for the attachment ifithier relalted obj acts,f gllile iiliventlioorci1 congirisei, the of a conventional, variable speed, driving arrangeea ures erema or y escri e an par icumen ,no s own. larly pointed out in the claims, the following de- The smoothing roll does not touch the support scription setting forth in detail a preferred, illusroll. A layer of fabric or other pliant material Ill trative embodiment of the invention, exemplary, is placed between the two surfaces. Felt has been however, of but one of the various ways in which found to be very satisfactory for this purpose, and the principle of the invention may be employed. it is conveniently provided in the form of 2, cyl- Tthe aci al iitatioi of the ii ivgrgzioig to the1 color infier slohthat iii;3 conlipllftely igCircles the sunport coa mgo ners or oorruga e ox oard wi lnow r0 is ma eria eeps e wire-woun roll be described, and illustrated in the accompanying clean as it is rotated in the groove in the direcdrawings, in which: tion opposite to the travel of the paper web. By

Fig. 1 is a diagrammatic sketch of the overall moving this wrapper or cushion occasionally, a coa ing operation. new, clean surface is provided. The cleaning Fig. 2 is an elevational view of a smoothing roll action obtained by this combination of reverse a e b y embo y gthe invention. drive on the roll and the wrapper or cushion rel 3 s an end view on line 33 of Fig. 2- sults in a greatly improved and uninterrupted g' s g s g iggg s fi g g ggglfgg t fi gm- 40 coating operation, previously unobtainable in the industry.

of i gm gg and f the In operation, a web of paper liner I from a feed i p081 lone. 9 eyond, the pomt Where roll or other source passes over one or more idle the coating composition is applied to the paper by the pump or gravity fed ap licator 3 Thi or guide rolls 2 and past an applicator device 3 roll of the type Shown in U S. gatent 1 43 45 for applying an excess of coating just ahead of may be of a diameter of about /2 to three inches, the wlre'wmpp'fid SmQOthmg r011 Thls ran and is closely and tightly wrapped over most of spreafds W coatmg umforml?" at a thlckness i its length, which is dependent upon the paper pendmg m part upon the dlameter of the Wlre width, with a relatively fine wire. The wire (11- used 9 the Smoothing r011- ameter may be in a range such as to give anyf It 15 gg to thehgreafly improved where frgm 10 t 1 wraps per inch a size ormance o is smoot ing roll that it be regiving about 0-70 wraps per inch has been f nd versibly driven, with respect to the direction of very suitable. Rust-resistant and wear-resistant paper movement Furthermore. it is v y des r- Wire should be used, such as stainless steel or b t a le speed drive e d, o Nichrome wire. vide for variations in viscosity of the coating com- 3 position; otherwise, less accurate control of the coating film thickness results.

The paper then passes by way of idler rolls to a drying device H, such as dryer rolls, before bein rerolled.

Having described the invention, what is claimed as new is:

1. Inappar atus for applying a'liquid coating composition to a moving web, including means for feeding a web through the apparatus and means for applying a coating compc'sitionto the moving web, the combination comprising a wirewrapped smoothing roll, means "for "reversibly driving said smoothing roll'operatively connected therewith, means for supporting said roll in smoothing relationship with said web, said smoothing roll support mcans' including a stationary backing roll having a longitudinal recess in the surface thereof in which said smoothing roll is disposed so as to'project therefrom; and a sheet offabricmaterial located in saidreeess and pressed hetwe'entheopposingsurfaces'of said hacking roll and said smoothingroll, said fabric 4 material serving as a Wiper for the smoothin roll.

2. The apparatus of claim 1 wherein said fabric material is in the form of a sleeve surroundin said backing roll.

ROBERT SHERMAN. LUTHER O. GKRLISLE.

REFERENCES CITED The following references are of record in the -file of this-patent:

' UNITED STATES PATENTS *N1'i'nit'ei Name Date 7811,659 'il iennedy et al Feb. 7, 1905 1,853,569 M01181 Apr. 12, 1932 2,146, 50? Mayer et a1. Feb. 7, 1939 2,334,102 Kauppi et a1. Nov. 9, 1943 FOREIGN PATENTS Number Country :Date

136, 307 GreatBritain Dec. 1-8,: 1919 

